it's been six months since ed snowden revealed the effort ops the national security agency phones' now congressman roger is investigating whether ed snowden was working alone or whether other governments may have played a role. catherine herridge is in washington. other governments to whom is he referring here? >> if you take a close review of the nasa nasa -- national security agency leaked documents they talk about the works overseas, and the chairman of the house intelligence committee, who gets regular brief examination -- briefings, says there is now evidence suggesting edward snowden had helped when he downloaded 200,000 documents. >> we know he did some things capability wise that were beyond his capabilities, meaning he used someone else's help to steal things from the people of the united states, classified information, information we use to keep america safe. >> and the former head of the nsa and said that his activities have permanently damaged u.s. security. >> it's very, very hard. this is the -- this is catastrophic for the safety and security of the american nation. what